<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>First-Child</title>
<style type="text/css">
:first-child {
	border: 1px solid;
}
</style>
</head>
<body>
	<div id="wrap">
		<div>0-1</div>
		<div>0-2</div>
		<div>0-3</div>
	</div>
	<div>1-1</div>
</body>
</html>